IIRC those exist for law firms and they are called knowledgebases or knowledge management (which also are broader technical terms). I came across them years ago doing some research, though I didn't look into them deeply.

Management can be difficult: Each 'module' needs a maintainer, someone responsible for keeping it updated, fixing problems, finding ways to integrate new concepts and requirements, etc. Based on what I know of law firms, finding attorneys with the time and attention for that can be difficult.